@article {Holt2000,
	title = {Alternative causes for range limits: a metapopulation perspective},
	journal = {Ecology Letters},
	volume = {3},
	year = {2000},
	pages = {41{\textendash}47},
	issn = {1461-023X},
	doi = {10.1046/j.1461-0248.2000.00116.x},
	url = {http://www.blackwell-synergy.com/links/doi/10.1046/j.1461-0248.2000.00116.x},
	author = {Holt, R D and Keitt, TH}
}
